Which power source uses the earth’s internal heat?

nuclear

hydroelectric

solar

geothermal

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous

What must be in balance for temperatures to remain constant?